Can I install both GTK+2 and GTK+3?

[David Buchan <pdbuchan yahoo com>]

I am using Ubuntu 13.04.


Rumour on the street (I *think* I read it somewhere) is that I can install both libgtk2.0-dev and 
libgtk-3-dev. Is that true? Can they both be installed without interfering with each other, and without 
breaking Unity?

I'd like to be able to provide executables of my program for those with GTK+2 and those with GTK+3. Maybe I'm 
safer to use two separate machines to compile. Unity seems .... mmmm .... delicate.

Dave